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Closes #12877
Summary
This should fix TypeScript upgrade issue. Interesting thing was caught by TS. For example, this:
Will throw: "Error: Cannot spy the ups property because it is not a function".
But here:
It throws: "TypeError: Cannot convert a Symbol value to a string". This is what TS was suggesting to fix. After this fix, the error message becomes: "Error: Cannot spy the Symbol(ups) property because it is not a function". Much better.
Also I spend some time trying out if
jest.spyOn
accepts keys as symbols. It does, all works. Only error messages is the issue. Would be nice to have tests for these, of course. Started working, refactoring some details and here I got stuck ;D Wait.. But that is another story already. Better I will make separate PR later.Test plan
Green CI.